1. Klinik und Poliklinik für Dermatologie und Allergologie (Emeritus), University of Bonn, Sigmund-Freud-Str. 25, 53105 Bonn, Germany
2. Servier International, 50 Rue Carnot, 92284 Suresnes Cedex, France
3. Harris Interactive, 5 Avenue du Château, 94300 Vincennes, France
4. Practice Dermatology & Phlebology, Helmoltzstr, 4–6, 53123 Bonn, Germany
5. Department of Dermatology, University of Cologne, Cologne, Germany